jpeg2000图像LL子带损坏代码块的恢复

Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005. Pub Date : 2005-12-21 DOI:10.1109/ISSPIT.2005.1577213

F. Zargari, O. Fatemi

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引用次数: 0

摘要

众所周知，自然场景的图像主要具有低频成分。JPEG 2000中使用的小波变换(WT)将变换后图像的低频集中在LL子带。因此，JPEG 2000编码图像的LL子带传输误差对感知图像的质量影响很大。JPEG 2000标准的另一个重要方面是使用较大的代码块(通常为32times32或更大)来提供足够的压缩效率。如此大范围的错误隐藏是一个具有挑战性的问题。用零(ZF)填充丢失的比特是唯一已知的大面积EC方法。本文介绍了一种针对LL子带的分割和条件替换(SCR)电磁法。该方法基于分割和替换(SR) EC方法，在LL子带中任意数量的丢失位平面的大面积上优于ZF方法

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Recovery of damaged code blocks in LL sub-band of JPEG 2000 images

It is well known that images of natural scenes have predominantly low frequency components. Wavelet transform (WT) which is used in JPEG 2000, concentrates the low frequency of the transformed image in LL sub-band. Hence, transmission error in LL sub-band of JPEG 2000 coded image affects the quality of the perceived image drastically. Another important aspect of JPEG 2000 standard is employing large code-blocks (normally 32times32 or larger) to provide sufficient compression efficiency. Error concealment (EC) in so large areas is a challenging problem. Filling the lost bits with zero (ZF) is the only well known EC method for large areas. In this paper the segmentation and conditional replacement (SCR) EC method is introduced for EC of LL sub-band. This method is based on the segmentation and replacement (SR) EC method and outperforms the ZF method at large areas for any number of lost bit planes in LL sub-band

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Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005.

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